Glow lamp



Aug-29, 1939. s. E. GERTLER GLOW LAMP Filed Aug. 3,A 1956 3 Sheets-Sheet 1 54m/1. E. Cia-num :Nw-:moa

ATTORNEY.

s. E'. GERTLER GLOW LAMP *I Aug. 29, 1939.

Filed Aug. 3, 1936 -3 Sheets-Sheet 2 ATTORNEY.

3 Sheets-Sheet 3 ATTORNEY.

Aug. 29, 1939. s. E. GERTLER GLOW LAMP Filed Aug. 3, 19256 Patented Aug. 29, 1939 UNITED vSTATES PATENT... `CFFICE GLOW LAMP Application August s, 1936, serial No. 94,094

9 Claims.

AThis invention relates to glow lamps, more particularly to that type of lamp wherein the light emitting element, which'is a closed conductor, is supported in a transparent envelope B containing an inert gas such as neon or argon gas, or from which all air and other gaseous substances have been exhausted, said light emitting element being subject to the inductive influence produced by high frequency electric current located exteriorlyof the envelope.

'I'he present invention contemplates certain improvements over that disclosed in my co-pending application, Serial No. 73,704 led April l0, 1936.

One of the objects of my invention is to provide a new and improved glow lamp wherein the glow member may be heated to as high a temperature as is necessary by induction without danger of melting or disintegrating the transparent envelope employed to house the glow 90v member.

Another object of the invention is to provide a glow lamp of the above type with means for uniformly` maintaining the envelope housing the glow member in a relatively cool condition.

Another object of the invention is to so form the transparent envelope housing the glow member that deposits caused by the vaporization of the glow member will not be condensed on that part of the envelope through which passes the light emitted from the glow member.

Another object of the invention is to provide a new and improved glow lamp wherein the part of the envelope enclosing the glow member will be located adjacent a bath of a circulating cooling fluid, thereby eliminating the necessity of using quartz or other high melting point materials which are diicult to Work and permitting the use of a cheaper material for forming the envelope such, for instance, as Pyrex glass or similar materials.

Another object of my invention is to provide a construction in a. glow lamp of the above type wherein the envelope proper which houses the glow member may be removed from the fluid cooling device when the glow member has deteriorated through `use and a fresh envelope housing a new glow member is to be employed.

60 Another object of the invention is to provide a construction wherein the means for cooling -the glow member or that part of it adjacent the glow member will be such that a uniform system of cooling is provided whereby local differential 55 expansion and contraction will not tend to crack the surface subjected to the action ofthe cooling medium.

Other objects and aims of the invention, more or less specific than those referred to above, will, be in part obvious and in part pointed out 5 in the course of the following description of the elements, combinations, arrangements of parts and applications of principles, constituting the invention; and the scope of protection contemplated will be indicated in the appended claims. 1')

In the accompanying drawings wherein I have illustrated preferred forms of embodiments of v my invention;

Figure l is a sectional view taken through a glow lamp, the glow member and its supporting 1" means being shown in side elevation,

Figure 2 is a similar view showing another embodiment of my invention, and

Figure 3 is a similar view showing another embodiment of my invention, and

Figure 4 is a similar View showing still another embodiment of my invention.

At this point it may be noted that I preferably construct the glow member in a manner described in my aforementioned application so that 2- the light will be emitted uniformly from al1 parts of the surface of the glow member. This is accomplished by increasing the thickness of the metal from the periphery of the metallic disc from which the glow member is constructed toward the central axis of said disc along a curve of pre-determined plottage so that the magnetic induction combined with the normal heat conductivity of the material of the glow member will result in a body which has all of its parts heated equally so that the incandescence of thev glow member will be equal throughout the entire body, thereby throwing a light beam, every part of which is equal to the other parts in its degree of luminosity.

I may state, however, that my important cooling means may be utilized with a glow member of any chosen construction.

Referring now to the drawings wherein similar 45 reference characters refer to similar parts throughout the views thereof and particularly to Figure 1, the reference-numeral l denotes an envelope which, in the present instance, is preferably formed of glass having a relatively high melting point but having a much lower melting point than quartz or similar substances which are expensive and diilicult to work. I have found ,thatl a glass known as Pyrex glass is suitable for the purpose intended. In this iigure of the drawings the envelope is shown as being substantially cylindrical in form, having a substantially flat light emitting surface 2, and having at its opposite end a bowl shaped part 3 which extends into the cylinder.

Erected upon a support by the part 3 is a post 4' and the upper end of the post 4 is provided with a plurality of prongs 5 and the glow member 6 is supported by the upper end of the prongs 5, preferably as shown. 'I'he glow member B has preferably a fiat light emitting surface 1 and a convex face 8, the convexity of the face 8 being formed on a curve of pre-determined plot- 'tage as above described whereby the entire area of the light emitting surface 1 will have a uniform degree of luminosity. y, www,

Of course, any one of the forms of glow members illustrated in my aforementioned application may be utilized instead of the one illust'rated herein. In fact, the particular form of glow member utilized is not material to the subject matter of the present invention, except that the glow member shall be of a unitary construction as illustrated in the above identified application.

The glow member 6 is preferably formed of tungsten and the supporting parts 4 and 5 are preferably formed of a high melting point metal such as tungsten. The reference numeral 9 denotes a coil whichsaid coil being positioned exteriorly of the envelope I. This coil is disposed symmetrically with respect to the glow member, it being the intention to so arrange the glow member with respect to the coil that the center of the mass of the glow member will be located at the center of the inductive field produced by the high frequency electric current which energizes the coil.

Referring now to Figure 2 of the drawings, the construction of the glow lamp is identical with the above described except that the light emitting end of the envelope I is of bulbous conformation as at I0.

Referring now to the embodiment of my invenftion illustrated in Figure 1 of the drawings, reference numeral II denotes a hollow casing, preferably cylindrically formed and having an inlet orifice I2 at its lower end and an exit orifice I3 at its upper end. It is intended that a fluid or liquid cooling medium, such for instance as water, will pass through the hollow space I4 of the casing II. In the present instance the envelope I is shown as being inserted within the casing II so that the walls of the envelope and the inner' wall of the casing II will be located in adjacency. In the present instance I have shown a space between the wall of the envelope and the inner wall of the casing, but in practice these two walls will be brought as closely together as is practical. The envelope` I is suitably supported by the bottom of the inner wall of the casing II as by means of the posts I5 or any other suitable means which might be adapted to achieve this purpose.

In the embodiment of my invention illustrated in Figure 2 of the drawings, the reference numeral I6 denotes a circular cylindrical receptacle, the upper circular edge of which is cemented, made integral with or otherwise connected as at I1 with a circular rib I8 formed exteriorly of the envelope housing the glow member. Water or other cooling fluid passes through the orifice I2 and finds its exit through theoriflce I3 as in the rst described embodiment of my invention.

In this embodiment of my vinvention it will benoted that the cooling liquid or fiuid comes in f the envelope I.

closer contact with the outer wall of the envelope and that the outer wall of the envelope and the inner wall of the cylindrical member I6 form a space I1 through which fiows the cooling medium.

Referring now to the embodiment of my invention illustrated in Figure 3 of the drawings, the construction of the glow lamp proper is identical with that illustrated in Figure 2 of the drawings, the hollow space I4, through which the cooling medium is circulated, being also identical with that of Figure 2.

In this embodiment of my invention, however, the casing I I is detachablonnected with the envelope housing V tlieglow member so in case of -breakagfsaid envelope or when the glow member has deteriorated through use or for any other reason it may become necessary to remove said envelope, means are provided whereby this can be accomplished and a fresh glow lamp associated' with the cooling medium.

In this embodiment of my invention I have provided a laterally vprojecting rim I9 on the glow member, and a similarly projecting rim 20 on the upper end of the casing II, a gasket 2l formed preferably of asbestos or like heat resisting material is interposed between these rims I9 and 20 to establish a fluid-tight connection between these parts. The assembly is held together by means of an encircling nonmetallic rim 22 having ears 23 through which passes a clamping screw 24. By means of this construction it will be noted that the envelope housing the glow member and the casing II may be readily detached from each other.

Referring now to the embodiment of my invention illustrated in Figure 4 of the drawings, in this embodiment I have illustrated a different form of envelope for housing the glow member. In this embodiment, the envelope I is provided with a circular bulge 25 in the vicinity of the glow member v26, which in the present instance is shown in a reverse position from that illustrated in the three previously described embodiments of the invention. The casing II is also provided with a bulge 21 directly opposite the bulge 25'01' The energizing coil is divided into two sections 28 and 29 respectively, both sections being wound on straight cylindrical parts 30 and 3| of the casing II. The sections 23 and 29 of the coil are connected by the wire 32 which extends from the uppermost coil of the section 29 to the lowermost coil of the section 2l.

It will be noted that the diameter of the casing II is sufiiciently great to permit the envelope I to be inserted Within said casing. In other words, the diameter of the envelope I at its widest part, which, of course, is at the bulge 25, is less than the diameter of the casing II.

The reference numeral 32 denotes a ringil formed in two parts and adapted to be connected together by means (not shown) which passes through apertures 33 formed in the ears 34 formed on said ring. The ring 32' is provided with the fingers 35,y which enter recesses 36' formed in the upper`` end of the casing II. The glow member near its upper end is provided with the circular inclined or wedge shaped surface 3G which terminates in a shoulder 31, this shoulder is adapted to be engaged by the spring lingers 39 also formed on the ring 32'.

The reference numeral -33/denotes a gasket which encircles the glow member I directly beneath the inclined or wedge shaped part 36, and the upper circular edge of the casing II engages this gasket .and forms a fluid-tight connection between said edge and the wall of the glow member.

I'he parts just described form a socket wherebythe envelope I of the glow lamp is readily .insertable into and removable from the casing Il when it is desired to introduce a fresh glow lamp into the cooling system. 'I'he cooling medium, as in the rst described embodiments of my invention flows into the space -Il formed between the envelope i and the casing il through the oriiicel I2 and said medium passes from said space1 I4 through the orifice 39 at the upper end of the casing il. y

It should be noted that the ring 22 in th embodiment of my invention shown in Figure 3 and likewise the ring 32 in the embodiment of the invention shown in Figure 4 are formed of a non-metallic substance, such for instance, as hard rubber or Bakelite so that there will be no metal substance to interfere with the inductive influence of the energizing coil of the glow member itself.

lso

It will accordingly be seen that I have provided constructions adapted to ,attain among others all the ends and objects above pointed out in a most facilemanner.

It will be noted that in all of the embodiments of the invention, the light emitting locality of the envelope is located at a substantial distance from the glow member and that the locality cooled by the water jacket, is relatively closer to the glow member. My object for this constructionisto provide a glow lamp in which the vapor produced by the heated glow member will condense or be deposited upon the relatively cooler part of the inside wall of the envelope. When gas is employed in envelopes of glow lamps, such as illustrated, a certain amount of circulation is set up within the envelope, and it is intended that this circulation of gas within the envelope will carry the vapor produced from the glow member past the cooler locality whereby this vapor will be condensed and deposited upon the cooler surface and thereby prevent it from being condensed or deposited on the locality oi the envelope through which passes the l beam of light produced by the glow member.

It 4will accordingly be seen that I have provided a lamp which can be produced at a modicum oi cost and which will accomplish, among others, al1 the ends of the invention in a most facile manner.

As many changes could be made in this construction without departing from the scope of the following claims, it is -intended that all matter contained in the above description or shown in the accompanying drawings shall be interpreted as illustrative only and not in a limiting sense.

.Having thus described my invention what I claim as new and vdesire to secure by Letters Patent is:

1. In a glow lamp of the class described, in combination, a cylindrically formed envelope composed of glass having a relatively high melting point, a post erected within said cylinder, a disc shaped glow member mounted upon said post, a hollow circular casing surrounding said envelope and disposed coaxially with respect to said glow member through which a cooling medium may be circulated and a coil surrounding said casing which is also disposed coaxially with respect to said glow 'memben 2. In a glow lamp of the class described, in

combination, a transparent cylindrical envelope composed of a substance having a relatively high melting point, a post erected within said envelope, a solitary disc shaped glow member supported by said post, a cylindrical formed casing surrounding said envelope and spaced therefrom adapted to receive a uid cooling medium, and a coil located exteriorly of said cylindrically formed member and also located coaxially with respect to said glow member.

3. In a glow lamp of the class described, in combination, a transparent cylindrically formed envelope formed of a relatively high melting point substance, a post erected within said envelope, a solitary disc shaped glowv member supported by said post, a cylindrically formed casing surrounding said envelope inthe vicinity of said glow member, the inner wall .of said casing being spaced from the outer wall of said envelope to form a chamber through which a uld cooling medium may circulate and a coil for energizing said glow member located exteriorally of said casing and also disposed coaxially with respect to said glow member.

4. In a glow lamp of the class described,`in-

combination, a transparent cylindrically formed envelope formed of a relatively high melting point substance, a post erected within said envelope, a solitary disc shaped glow member supported by said post, a cylindrically formed casing surrounding said envelope in the vicinity of said glow member, the inner wall of said casingv being spaced from the outer wall of said envelope to form a chamber through which a iluid cooling medium may circulate and a coil for energizing said glow member located exteriorly of said casing and also disposed coaxially with respect to said glow member, and said glow member being removable from said casing.

5. In a glow lamp of the class described, in combination, a cylindrically formed envelope composed of glass having a relatively high melting point, a post erected within said cylinder, a disc shaped glow member mounted upon said post,

.a hollow circular casing surrounding said envelope and disposed coaxially with respect to said glow member through which a cooling rnediurn may be circulated, and a coil surrounding said casing which is also disposed coaxially with respect to said glow member, said envelope being freely insertable into and removable from said hollow circular casing.

6. In a glow lamp of the class described, in combination, a translucent envelope adapted to house a glow member, a casing surrounding a portion of said'envelope and spaced therefrom toform a reservoir through which circulates a cooling medium, means for detachably connecting said casing to said envelope and a coil surrounding said casing and coaxially disposed with respect to said glow member.`

7. In a glow lamp of the class described, in combination, a unitary glow member, a translucent envelope forming a housing for said glow member and in which said glow member is supported,- the envelope of said glow member having a circular bulged part directly opposite the lateral edge of the glow member, a casing surrounding a part ofk said envelope and spaced therefrom to form a circular chamber through which passes a fluid cooling medium and means for detachably connecting said glow member with said casing.

8. In a glow lamp of the class described, in

combination, a unitary glow member, a translu- 15 necting the envelope housing the glow` member with said casing. y 'l 9. In a. glow lamp of the class describedpin combination, a translucent envelope, a circular. solid metallic disc-shaped glow member supported within said envelope, a coil encircling said glow member and envelope, and a bath between said glow member and said coil through which a. cooling medium ows, disposed coaxially with respect to said glow member.v

SAMUELE. GER'i'LER. 

